August weather forecast
Naha, Japan

August weather in Naha, Japan, maintains a consistent pattern with that of July. The city continues to revel in the charm of the summer month with high temperatures and humid conditions. However, August stands out with a significant increase in rainfall, a jump to 241mm (9.49"). Despite the rainfall, the city maintains charm and vibrancy, encouraging visitors to indulge in city walks or sea-side lounging. High sea temperatures set the stage for thrilling water sports and leisurely sea side activities.

Temperature

With August's advent, Naha sees an average high-temperature of a still hot 31.5°C (88.7°F), subtly shifted from July's 31.8°C (89.2°F). August nights cool to an average low-temperature of 26.6°C (79.9°F), a marginal decrease from its daytime equivalent.

Heat index

Throughout August, the heat index is estimated at a blistering 42°C (107.6°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Note that heat index values are valued for light wind and location in the shade. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', represents the fusion of temperature and moisture in the air to suggest how warm it feels. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

In August, the average relative humidity is 78%.

Rainfall

In Naha, during August, the rain falls for 13.6 days and regularly aggregates up to 241mm (9.49") of precipitation. In Naha, during the entire year, the rain falls for 140.8 days and collects up to 2037mm (80.2") of precipitation.

Sea temperature

The month with the warmest seawater in Naha, Japan, is August, with an average sea temperature of 28.7°C (83.7°F).
Note: Water temperature from 25°C (77°F) to 29°C (84.2°F) is considered very warm, making water activities enjoyable for prolonged periods without any uncomfortable sensations.

Daylight

In August, the average length of the day is 13h and 3min.
On the first day of August in Naha, sunrise is at 05:55 and sunset at 19:16. On the last day of the month, sunrise is at 06:08 and sunset at 18:50 JST.

Sunshine

In Naha, the average sunshine in August is 6.9h.

UV index

The months with the highest UV index in Naha are May through August, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme threat to health from unsafe exposure to UV radiation for the average person.
Note: A maximum UV index of 12 in August translates into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Broad-spectrum SPF 30+ sunscreen must be generously applied and reapplied every two hours or post any outdoor activity or swim. Attention! The combination of sand and water reflections enhances UV ray intensity.